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• Making ffmpeg/javacv less verbose in java

  16 octobre 2022, par lejlot

  I have a Java application that uses ffmpeg library and javacv to load and process video files.

  



  I am currently using following code, for loading videofile to my data container.

  



  public boolean add(String videofile) {
        FrameGrabber g = new OpenCVFrameGrabber( videofile );
        try{ 
            g.start();
        }
        catch(Exception e){
            g = new FFmpegFrameGrabber( videofile );
            try {
                g.start();
            }catch(Exception x){
                return false;
            }
        }
        grabbers.add( new Pair(videofile, g) );
        frames.add( 0 );
        preprocessed=false;
        return true;        
    }


  



  Each time video is loaded, a library outputs a lot of meta information regarding video itself :

  



  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/lejlot/data/test.mp4' : 
 Metadata :
 major_brand : isom
 minor_version : 512
 compatible_brands : isomiso2mp41
 encoder : Lavf53.21.1 Duration : 00:04:36.27, start : 0.000000, bitrate : 305 kb/s
 Stream #0:0(und) : Video : mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 303 kb/s, 20,85
 fps, 30 tbr, 1k tbn, 1k tbc
 Metadata :
 handler_name : VideoHandler

  


  



  which obviously I do not want to see. I cannot (do not want) to modify the libraries source codes, but rather modify my own so it can intercept this log and discard it.

  



  As far I tried to temporarly block the stdout/stderr streams through

  



  private static final devnull = new PrintStream(new OutputStream() {
        @Override
        public void write(int b) {
            //DO NOTHING
        }
        @Override
        public void write(byte[] b,int x,int y){
        }
   });

   /**
   * Blocks messages to stdout
   */
   public static void silentStdOut(){
     System.setOut(devnull);
   }

   /**
   * Blocks messages to stderr
   */
   public static void silentStdErr(){
     System.setErr(devnull);
   }


  



  but it does not seem to help, log message is still displayed

  



  public boolean add(String videofile) {
    Utils.silentStdErr();
    Utils.silentStdOut();
    FrameGrabber g = new OpenCVFrameGrabber( videofile );
    try{ 
        g.start();
    }
    ,,,


  



  "Raw" ffmpeg can be set to be less verbose using

  



  ffmpeg -loglevel panic


  



  but neither OpenCVFrameGrabber not FFmpegFrameGrabber give access to the tool's parameters.

  



  To sum up - how can I discard these log messages without modifing the libraries' source codes ?

  


• rtpdec_qt : Use a local variable instead of RTP_FLAG_KEY

  4 mars 2015, par Martin Storsjö

  rtpdec_qt : Use a local variable instead of RTP_FLAG_KEY
  The only case where RTP_FLAG_KEY actually is needed is
  
  in RDT, where such a flag needs to be passed via the
  
  rtpdec parse function’s flags parameter.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] libavformat/rtpdec_qt.c

• How to play local video using ffplay and nginx ?

  17 février 2016, par Bhoomi Loriya
  • I want to play video using ffplay.I store data in local machine.
    directory path is like :
    C:\ffmpeg\bin
  • Using this command i cant play this video.
    
ffplay frlive.m3u8
  • Above code can’t work.
  • If i am play live video than they work fine this code is like :
    ffplay -i  <a href="http://media.webtvlive.eu/rtc/_definst_/mp4:live_720p.stream/playlist.m3u" rel="nofollow">http://media.webtvlive.eu/rtc/<em>definst</em>/mp4:live_720p.stream/playlist.m3u</a>
     This code work properly.